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Your next step will be to determine the length of arc from 10-9.
Not the cord length (many books miss this) you need the arc length.
Once you find this it is the same for all (9-8 is the same as 10-9).
Tip- you can find the arc length by
copy and paste pie shape away from the drawing.
trim the pie
list the arc

Draw circle of R 10-9 arc length at point 10' in your flat development..
Draw circle of R A-9' at point A

Yes I am. I have seen the pictures of Plate 3 posted. It shows that the end result is supposed to be but not how to get there. I attached a picture of where I have reached. I assume I do the same thing on the left side but not sure what to do next on the right.

This is what I have come up with following instructions that I found online, though they were for a symmetrical piece. I know something is wrong as my arc on the inside isn't correctly meeting the lines for each point. However, I do not know what. Please help when able.